//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package com.ishitong.freesql.ognl;

import java.lang.reflect.Array;
import java.util.Map;

/**
 * Implementation of PropertyAccessor that uses numbers and dynamic subscripts
 * as properties to index into Java arrays.
 * 
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
public class ArrayPropertyAccessor extends ObjectPropertyAccessor implements PropertyAccessor // This
// is
// here
// to
// make
// javadoc
// show
// this
// class
// as
// an
// implementor
{
	public Object getProperty(Map context, Object target, Object name) throws OgnlException {
		Object result = null;

		if (name instanceof String) {
			if (name.equals("length")) {
				result = new Integer(Array.getLength(target));
			} else {
				result = super.getProperty(context, target, name);
			}
		} else {
			Object index = name;

			if (index instanceof DynamicSubscript) {
				int len = Array.getLength(target);

				switch (((DynamicSubscript) index).getFlag()) {
				case DynamicSubscript.ALL:
					result = Array.newInstance(target.getClass().getComponentType(), len);
					System.arraycopy(target, 0, result, 0, len);
					break;
				case DynamicSubscript.FIRST:
					index = new Integer((len > 0) ? 0 : -1);
					break;
				case DynamicSubscript.MID:
					index = new Integer((len > 0) ? (len / 2) : -1);
					break;
				case DynamicSubscript.LAST:
					index = new Integer((len > 0) ? (len - 1) : -1);
					break;
				}
			}
			if (result == null) {
				if (index instanceof Number) {
					int i = ((Number) index).intValue();

					result = (i >= 0) ? Array.get(target, i) : null;
				} else {
					throw new NoSuchPropertyException(target, index);
				}
			}
		}
		return result;
	}

	public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
		Object index = name;
		boolean isNumber = (index instanceof Number);

		if (isNumber || (index instanceof DynamicSubscript)) {
			TypeConverter converter = ((OgnlContext) context).getTypeConverter();
			Object convertedValue;

			convertedValue = converter.convertValue(context, target, null, name.toString(), value, target.getClass().getComponentType());
			if (isNumber) {
				int i = ((Number) index).intValue();

				if (i >= 0) {
					Array.set(target, i, convertedValue);
				}
			} else {
				int len = Array.getLength(target);

				switch (((DynamicSubscript) index).getFlag()) {
				case DynamicSubscript.ALL:
					System.arraycopy(target, 0, convertedValue, 0, len);
					return;
				case DynamicSubscript.FIRST:
					index = new Integer((len > 0) ? 0 : -1);
					break;
				case DynamicSubscript.MID:
					index = new Integer((len > 0) ? (len / 2) : -1);
					break;
				case DynamicSubscript.LAST:
					index = new Integer((len > 0) ? (len - 1) : -1);
					break;
				}
			}
		} else {
			if (name instanceof String) {
				super.setProperty(context, target, name, value);
			} else {
				throw new NoSuchPropertyException(target, index);
			}
		}
	}
}
